11-11-2012, 07:39 AM
The Hardinge, Accu-Trak, and Form Rol Die brand straddle and bump knurling tools that I've used in job shops over the years have all been unhardened bodies with HSS or carbide pins. I can't say for certain what materials they use for all the parts, but it seems like pre heat treated (28-32Rc) 4140 and.or 8620. Those are the two most common materials used in making toolholders.
I know the solid carbide pins really last longer than HSS in thos applications, and none of them are press fit. They slide in easily so that if you are using HSS pins and the pin gets buggered up from a smash, you still have a chance of getting it out. I've seen their solid carbide pins survive multiple crashes.
I know the solid carbide pins really last longer than HSS in thos applications, and none of them are press fit. They slide in easily so that if you are using HSS pins and the pin gets buggered up from a smash, you still have a chance of getting it out. I've seen their solid carbide pins survive multiple crashes.